MAINT bump joblib to 0.8.2
Merge pull request #3328 from ogrisel/joblib-0.8.2

MAINT bump joblib to 0.8.2
DOC SVMs take string class labels as well as integers

http://stackoverflow.com/a/24512272/166749
MAINT remove residual sparsefuncs*.so when compiling

The sparsefuncs -> sparsefuncs_fast rename in bbb8f1d has caused a lot of errors being reported due to dirty working directories. This attempts to avoid that.
tree: add min_weight_fraction_leaf
forest: add min_weight_fraction_leaf
min_weight_fraction_leaf and min_samples_leaf: test both best-first and depth-first tree building
gbrt: min_weight_fraction_leaf value test
tree: use min_weight_leaf internally while exposing min_weight_fraction_leaf
utils.testing: add assert_greater_equal and assert_less_equal
forest: test min_samples_leaf and min_weight_fraction_leaf
min_weight_fraction: comments and pep8
test assert_greater_equal and assert_less_equal
min_weight_fraction_leaf: narrative docs
min_weight_fraction_leaf: narrative doc update
Update what's new
MAINT skip tests that require large datadownload under travis
fix typo (on -> one)
Merge pull request #3334 from ami-GS/external

fix typo (on -> one)
MAINT add docstring to explain the motivation of the fixture